Patent GB-191012749-A (GB)
Title: Improvements in or connected with Automatic Machines for Packeting, Weighing and Delivering Given Quantities of Granular or Powdery Material.
Inventor: PROKOFIEW GEORGE
IPC: G01G13/00
Filed: 1910-05-25
Granted: 1911-05-25
Abstract: 12,749. Prokofiew, G. May 25. Automatic-feed weighers.-Relates to a machine for automatically weighing powdery material into packets and delivering the filled packets ready for closing, and the invention comprises means whereby the packets are presented successively beneath two feed-spouts, the feeds from which are diminished as the leading packet approaches the requisite weight, until, at the correct weight, the depression of a weighing- scale on which the leading packet rests cuts off the feed. The first feed-spout, that is, the one not connected with the weighing-scale, may be dispensed with. The material passes down a bifurcated shoot c<2> into two feed-chambers c*. c containing skeleton d r u m s intermittently rotated by means of a feed-shaft c<3>. The packets, traversed along guide-rails by means of chains, are automatically presented beneath the feed-chambers at the proper time, the first portion of the charge being received from the chamber c* and the remainder from the chamber c, beneath which the pan of the weighing-scale is situated. The intermittent rotation of the shaft c<3>, the speed of which is varied 'during the feed, is derived from the main shaft c<5> through a countershaft e, feed-disk shaft d<12>, Fig. 1, and a feed-clutch shaft (not shown). Assuming a packet i to have received its full charge, an enclosed attachment of the beam completes an electric circuit, and an electro-magnet, by disengaging a catch, allows the feed-gates to close. At the same time, a second electro-magnet d<21>, Fig. 9, attracts an armature d<22> and, by means of a pivoted bar d<19>, allows a catch d<17> pivoted to a crank d<16> to move into engagement with a constantly rotating ratchet-wheel d<15>, loose on the shaft d<12>. The shaft d<12> then makes one revolution, and the catch d<17> is withdrawn from the ratchet-wheel d<15> by a cam on the bar d<19>. This rotation causes (by means of cams on the shaft d<12>) an arm to hold the pan of the weighscale temporarily, and sets in motion the packetconveyer so as to move another packet on to the scale pan, the conveyer then making a slight movement in the reverse direction to leave the packet free on the scale. The same rotation of the shaft d<12> also gives a slight rotation to a leather-rimmed wheel f which is thus brought into frictional engagement with a continuouslyrotating wheel g<1>. The wheel f makes one revolution, and a cam f<13> thereon operates a lever c<28> to open the feed-gates and causes the engagement of two-speed mechanism situated on the shafts e, d<12> so as to give the faster of the speeds to the shaft e, and consequently to the feed-drums. Before the packet is filled, however, a second cam f<14> on the wheel f, adjustable in relation to the cam f<13>, engages a roller e<11> and puts in the lower gear so as to produce the dribble feed. The weight is then completed, and the above-mentioned electro-magnets are again energized, and the shaft d<12> again rotated. During the rotation of the shaft d<12>, and consequent movement of the packets &c., a feeddisk on the shaft d<12> throws the feed-clutch shaft (not shown) out of gear, and arrests the feed-drums. A wipe contact on the end of the shaft d<12 >is adapted to break the electric circuit prior to the break on the beam attachment, so as to prevent injurious sparking at this point. The packets i, Fig. 9, after leaving the scalepan, descend a series of vibrating steps l<5>, and at the same time short. filling-tubes i<1> are retained on vibrating rails l<7>. Any dust escaping from the feed-chambers c*, c or over the steps l<5> is drawn or led into a box o<2>.